Modern young people and celebrities rely on the chemistry of dyes to change their hair color and enhance their dramatic personalities. Elderly people also rely on dyeing chemicals to disguise aging and extend the spring of life. Therefore, hair dyeing has become a trend nowadays.
Materials used for hair dyeing
Most of the materials used for hair dyeing are chemical dyes, which are chemically synthesized from petroleum and other products. Although these dyes have attractive colors, some are carcinogenic and contain heavy metal elements that are harmful to the human body, such as lead, nickel, and mercury. wait. The chemical substances in the dye are applied to the scalp, heated, penetrated the skin, and circulated throughout the body with the blood, affecting the hematopoietic system. In severe cases, they may even cause malignant tumors of the hematopoietic system such as leukemia. It has now been proven that benzene and its derivatives in hair dyes may cause blood system diseases. In addition to blood diseases, hair dyes, like most cosmetics, may cause allergies and other allergic diseases, manifested as erythema, papules, local itching, and pain on the scalp and surrounding skin.
Principle of hair dyeing
The principle of hair dyeing is not to attach the pigment to the hair. If the pigment is only attached to the epidermis, the dyed color will certainly not last long. Hair dyeing is a process of opening all the cuticles of the hair epidermis, allowing color particles to enter the cortex, and combine with hydrogen peroxide to produce new colors. Under a microscope, the biggest characteristic of the surface of healthy hair is that it is covered with layers of neatly arranged epidermal scales. Therefore, whether the epidermal scales are open or closed determines the degree of hair damage. Hair dye is an alkaline substance, which will cause the epidermal scales to open. At this time, the hair is already in a “fake health” state, which will cause considerable damage to the hair. Therefore, you should pay attention to replenishing nutrients to the cortex in time after dyeing the hair and Repairing the scales on the epidermis, allowing them to close neatly and tightly again so that the color will not flow out easily.
During the hair dyeing process, the alkaline substances in the chemicals will cause the epidermal scales to open further, so the hair quality problem after dyeing will be more serious. In addition to paying more attention to hair care and repair, you must also pay special attention to it. Make sure your hair has enough rest time. After dyeing your hair, wait at least a while before perming it. You should also choose a milder product for the solution. If you want to dye your hair again, you have to wait for about two months to reduce the damage.
